Magnus McFall is no stranger to trouble, but he never expected a life sentence. He is arrested just as a pandemic called 'The Sweats' hits London. Growing public disorder results in emergency powers and he finds himself imprisoned without trial. An unlikely alliance with long-termer Jeb and a prison riot offer the opportunity of escape. The two men force their way through the devastated city and head north into countryside fraught with danger. Magnus is unsure if Jeb is an ally or an enemy and soon he is forced to decide how far he will go in order to survive.